North Sea sub-stocks of plaice studied.

<p>The area covered by plaice migration between summer feeding aggregations (sub-stocks A, B, and C) and winter spawning grounds (light blue areas, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0108539#pone.0108539-VanNeer1" target="_blank">[55]</a>) was divided into 6 regions: the English Channel (EC: latitude <51.00°N), the Southern North Sea (SNS: latitude = 51.00–52.49° N), the Western North Sea (WNS: latitude = 52.50–55.49°N; longitude <2.50°E), the Central North Sea (CNS: latitude = 52.50–55.49°N; longitude = 2.50–4.99°E), the Eastern North Sea (ENS: latitude = 52.50–55.49°N; longitude ≥5.00°E) and the Northern North Sea (NNS: latitude ≥55.50°N). Arrows show principal migration routes for each sub-stock <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0108539#pone.0108539-Hunter1" target="_blank">[45]</a>.